Seiko Cal. 6639 - 724

The 6639-724 is a sought-after Solar piece from Seiko's golden era. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-ea700322fe79]

Also known as: Bullhead, Navigator

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

41mm

Case Thickness

15.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Champagne

Jewels

23j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1977

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